WD1032 + 011, an inflated brown dwarf in an old eclipsing binary with a white dwarf
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Citation (published version)S.L. Casewell, C. Belardi, S.G. Parsons, S.P. Littlefair, I.P. Braker, J.J. Hermes, J. Debes, Z. Vanderbosch, M.R. Burleigh, B.T. Gänsicke, V.S. Dhillon, T.R. Marsh, D.E. Winget, K.I. Winget. 2020. "WD1032 + 011, an inflated brown dwarf in an old eclipsing binary with a white dwarf." Monthly Notices of the Royal Astronomical Society, Volume 497, Issue 3, pp. 3571 - 3580. https://doi.org/10.1093/mnras/staa1608
We present the discovery of only the third brown dwarf known to eclipse a non-accreting white dwarf. Gaia parallax information and multicolour photometry confirm that the white dwarf is cool (9950 ± 150 K) and has a low mass (0.45 ± 0.05 M⊙), and spectra and light curves suggest the brown dwarf has a mass of 0.067 ± 0.006 M⊙ (70MJup) and a spectral type of L5 ± 1. The kinematics of the system show that the binary is likely to be a member of the thick disc and therefore at least 5-Gyr old. The high-cadence light curves show that the brown dwarf is inflated, making it the first brown dwarf in an eclipsing white dwarf-brown dwarf binary to be so.
RightsThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 497, Issue 3, pp. 3571–3580. © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.